“…50 Clinical variability is wide even in the same family, and, as commonly observed, the seriousness of the somatic involvement often does not correlate with the severity of the ID. Several other rarer signs have been reported, as pigmentation disorders, 43,49 supernumerary teeth, 45,46,49 ocular anomalies, 47,49 and others. 44,48,49 This wide spectrum of clinical presentations of ZLS reported in the literature could be partly due to the absence, to date, of any confirmatory diagnostic test aimed at clearly defining the ZLS phenotype as compared with the overlapping conditions (DOOR and Cantù syndromes).…”